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DataWars:
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SELECT basics
quiz
SELECT from world
quiz
SELECT from nobel
quiz
SELECT in SELECT
quiz
SUM and COUNT
quiz
JOIN
quiz
More JOIN
quiz
Using NULL
quiz
Self JOIN
quiz
Reference
NoSQL zoo
SELECT
Functions
SELECT .. WHERE
SELECT .. GROUP BY
SELECT .. JOIN
SELECT .. SELECT
INSERT .. VALUES
INSERT .. SELECT
UPDATE
DELETE
CREATE TABLE
CREATE VIEW
CREATE INDEX
DROP
ALTER
UNION
LEFT JOIN
NULL
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DataWars: Practice Data Science/Analysis with +100 Real Life Projects